Simple answer - Two meters or shorter, use unbalanced (RCA) cables.
The common mode rejection which makes balanced line and mic cables suitable for long distances is not an advantage here. If anything, it is a disadvantage, requiring an additional gain stage to ramp up -10dBm signal to +4, and to invert phase in order to filter cable-borne interference (that's the common mode part: the source component inverts phase, the amplifier inverts it again getting it back to normal, cancelling out interference and noise that could have entered along the length of the cable).
Even better: Unshielded cables. Lower capacitance = greater signal purity than cables with a coaxial shield but still very effectively shielded with twisted pair construction.
Like these: Stager Silver Solids Pure Silver High-End Audio Cables